Added pgo build fix

firefox.spec

@@ -157,6 +157,7 @@ Patch48:        build-arm-wasm.patch
 Patch49:        build-arm-libaom.patch
 #Patch50:        Bug-1610814-Fix-NEON-compile-error-with-gcc-and-RGB-.patch
 Patch53:        firefox-gcc-build.patch
+Patch54:        pgo-build-python.patch
 
 # Fedora specific patches
 Patch215:        firefox-enable-addons.patch
@@ -369,6 +370,7 @@ This package contains results of tests executed during build.
 %patch49 -p1 -b .build-arm-libaom
 #%patch50 -p1 -b .build-arm-SwizzleNEON
 %patch53 -p1 -b .firefox-gcc-build
+%patch54 -p1 -b .pgo-build-python
 
 # Fedora patches
 %patch215 -p1 -b .addons

pgo-build-python.patch

@@ -0,0 +1,15 @@
+diff -up firefox-81.0.1/build/mach_bootstrap.py.old firefox-81.0.1/build/mach_bootstrap.py
+--- firefox-81.0.1/build/mach_bootstrap.py.old	2020-10-06 14:16:06.212974910 +0200
++++ firefox-81.0.1/build/mach_bootstrap.py	2020-10-06 14:19:03.313179557 +0200
+@@ -507,7 +507,10 @@ class ImportHook(object):
+         # doesn't happen or because it doesn't matter).
+         if not os.path.exists(module.__file__[:-1]):
+             if os.path.exists(module.__file__):
+-                os.remove(module.__file__)
++                try:
++                    os.remove(module.__file__)
++                except:
++                    pass
+             del sys.modules[module.__name__]
+             module = self(name, globals, locals, fromlist, level)
+